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exchange 2010 not passing email to exchange 2013

Posted on 2014-11-12
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Last Modified: 2014-11-12
I have implemented a new exchange 2013 box into co-existence with a 2010 exchange box.  Email is flowing into both sides, but anything going to the old 2010 box will not pass through to the 2013 anymore.  It was working, but now it all queues up and I get a nonexistent domain error in the queue.  Any ideas?  I have attached the error.
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Question by:sidelogic
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Rajitha Chimmani earned 500 total points
ID: 40438521
The authentication error message points to some misconfiguration on receive connectors. You might want to check the receive connectors on Exchange 2013 server or create an additional receive connector to accept emails from Exchange 2010 boxes.

Ref: http://msexchangeguru.com/2013/08/03/e2013-2010mailflowissue/
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by:sidelogic
ID: 40438801
That did it.  I had an entry in our relay for the subnet of the 2010 server!  UGH!
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